What is the advice for someone who rushes their prayer, and people mock them, yet they content themselves by saying that "it is Allah who accepts and judges the prayer"?

If haste in prayer leads to neglecting ṭumaʾnīnah (tranquility), and ṭumaʾnīnah is a pillar, then the prayer is invalid, according to the Hadith (definition) of the one who prayed poorly. However, if the haste does not compromise the pillars and obligatory duties, then it leads to a deficiency in khushūʿ (devotion). Khushūʿ is a Sunnah (definition) according to the majority of scholars, while some scholars consider it an obligation whose abandonment invalidates the prayer. Therefore, it is advisable to maintain khushūʿ and serenity in prayer to avoid scholarly disagreement.